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From: Kees Cook <keescook@google.com>
Date: Fri, 23 Jun 2017 11:35:56 -0700
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Subject: Re: enabling COMPILE_TEST support for GCC plugins in v4.11
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>,
        Tony Breeds <tony@bakeyournoodle.com>,
        Stephen Rothwell <sfr@canb.auug.org.au>, Arnd Bergmann <arnd@arndb.de>,
        Randy Dunlap <rdunlap@infradead.org>, Olof Johansson <olof@lixom.net>,
        Mark Brown <broonie@kernel.org>, info@kernelci.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Will Deacon <will.deacon@arm.com>,
        Russell King - ARM Linux <linux@arm.linux.org.uk>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux-Next <linux-next@vger.kernel.org>,
        Fengguang Wu <fengguang.wu@intel.com>,
        Andrew Donnellan <andrew.donnellan@au1.ibm.com>,
        Laura Abbott <labbott@redhat.com>, "x86@kernel.org" <x86@kernel.org>
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On Thu, Jun 22, 2017 at 10:43 PM, Michael Ellerman <mpe@ellerman.id.au> wrote:
> [Old thread just popped up in my inbox]
>
> Kees Cook <keescook@google.com> writes:
>> On Thu, Dec 8, 2016 at 5:52 PM, Paul Gortmaker
>> <paul.gortmaker@windriver.com> wrote:
>>> On Thu, Dec 8, 2016 at 2:00 PM, Kees Cook <keescook@google.com> wrote:
>>>> Hi,
>>>>
>>>> I'd like to get the GCC plugins building under
>>>> allyesconfig/allmodconfig for -next soon (with the intention of
>>>> landing the change in v4.11). Specifically, I intend to revert
>>>> a519167e753e ("gcc-plugins: disable under COMPILE_TEST").
>>>
>>> If I recall correctly, I noted that the plugins broke the kernel.org
>>> cross compiler toolchains which led to the above disable.
>>
>> Do you mean these?
>> https://www.kernel.org/pub/tools/crosstool/
>
> I think those are the ones Paul is talking about.
>
> Those were mostly built by Tony, who is know, sadly, an Openstack
> developer and for some reason doesn't seem to have time to build
> toolchains for kernel hackers :P
>
>
> As folks may have seen on LWN, there are now pre-built toolchains for
> many architectures available from the Free Electrons guys, so that may
> help to unblock this situation somewhat:
>
> http://toolchains.free-electrons.com/

Perhaps we should add a link in pub/tools/crosstool/ ? 4.6.3 is pretty
old at this point, but the Free Electrons toolchains don't include
some of the less used architectures.

-Kees

-- 
Kees Cook
Pixel Security